Ceanothus oliganthus var. oliganthus

Common names: Hairy ceanothus
Synonyms: Ceanothus divaricatus Nuttall C. hirsutus Nuttall
Treatment appears in FNA Volume 12. Treatment on page 88.

Stems: branchlets ± flexible, puberulent to villosulous. Leaf blades ovate, elliptic, or elliptic-oblong, adaxial surface usually villosulous, sometimes glabrate. Flowers: sepals, petals, and nectary blue or purplish blue; nectary and ovary glabrous. Capsules glabrous; valves smooth, usually crested, sometimes not.

Phenology: Flowering Mar–Jun.
Habitat: Open slopes and ridges, chaparral, woodlands.
Elevation: 60–1500 m.


Variety oliganthus occurs primarily in the Coast Ranges south of San Francisco Bay, the Transverse Ranges, and the northern Peninsular Ranges. Putative hybrids and intergradation with var. orcuttii and Ceanothus tomentosus var. olivaceus have been reported from the Santa Ana Mountains, California (M. Van Rensselaer and H. McMinn 1942).

Selected References


Lower Taxa

Clifford L. Schmidt† +  and Dieter H. Wilken +
Nuttall +
Hairy ceanothus +
60–1500 m. +
Open slopes and ridges, chaparral, woodlands. +
Flowering Mar–Jun. +
in J. Torrey and A. Gray, Fl. N. Amer. +
Ceanothus divaricatus +  and C. hirsutus +
Ceanothus oliganthus var. oliganthus +
Ceanothus oliganthus +
variety +